modem

CSU/DSU

Various interfaces for WAN

Different types of switches

DSL concept

Asymmetric DSL/Symmetric DSL

PSTN

PPP

Configure clock frequency

HDLC

Package configuration

frame relay

ATM

advantage

shortcoming

advantage

shortcoming

The difference between next hop and outbound interface

The convergence process of dynamic routing protocols

Understand routing protocols and routed protocols

The concept of IGP and BGP

The concept/direction of routing entries is opposite to the direction of data transfer

Management Distance Review

Types of dynamic routing protocols

Classful/classless routing protocols

Upper layer protocol support

Classful routing protocol

timer

metric

multicast address

RIPv2

administrative distance

Review the routing table synchronization process

The creation of a loop

Anti-ring mechanism

zoning concept

Capture packets

Encapsulated directly in the link header

Device ID

Software version

address

Peer interface ID

VTP domain name

duplex mode

Global on/off

Interface on/off

show cdp neighbor

show cdp traffic

show cdp interface

POST function

BootStrap function

ROMMonitor function

1. Manually specify

2. Find the first available IOS in flash

3. Find available IOS on the tftp server

4. Enter miniIOS

5. Enter ROMMonitor

1.RAM

2.NVRAM

3.tftp

16 bits

last 4 bit group

The penultimate 4-bit group

Implementation process

InterfaceCost

Calculation of measure values

Topology

neighbor

route

Hello

DBD

LSU

LSR

LSAck

7 state machines

Down, Init, Tow-way, Ex-start, Exchange, Loading, Full

Several important factors affecting the establishment of neighbors

The concept of DR/BDR

election mode

Regional distribution principles

ABR/ASBR

1. Start the OSPF process

2. Declare the interface

OSPF load balancing

OSPF certification

OSPF inspection

Large address space

Mobility/Flexibility

Simple head structure

Convenient conversion

display method

writing skills

Unicast

multicast

arbitrary wave

global unicast

link local

Dual stack

handmade tunnel

6-4 Tunnel Technology

RIPng

OSPFv3

EIGRP

Advanced distance vector

No class

Support VLSM

Reliable transmission

DUAL algorithm

Convergence speed

trigger update

single multicast combination

Multi-protocol module

neighbor list

topology table

routing table

hello

update

request

reply

ack

Calculate loop-free paths/alternative paths

successor

feasible successor

FD

AD

feasible conditions

Only supports MD5 authentication

Key chain configuration

Enable EIGRP authentication

Enter the EIGRP process

Announce EIGRP interface

Non-equivalent load balancing

Manual aggregation

Check the EIGRP process

View EIGRP interface

View EIGRP neighbors

View the EIGRP topology table

2-1001

802.1q

ISL

The difference between the two

concept

effect

server

client

transparent

respective functions

domain name

password

Configuration version number

VTP advertisements are sent for multicast

trigger update

Refresh every 5 minutes

1. Data filtering

2. Data classification

1. Source IP

2.Destination IP

3. Agreement number

4. Source port

5.Destination port

1.Apply in both directions of the interface

2. Apply on vty interface

First hit bounce rule

1. Standard ACL

2. Extend ACL

3. Name the ACL

1. There can only be one ACL per interface, per protocol, and in each direction.

2. The specific ACL statement should be at the top

3. Create the ACL in global mode and then call it in interface mode

4. A deny all statement will always be hidden at the end of the ACL.

5. Extended ACLs should be deployed close to the source, and standard ACLs should be deployed close to the destination.

two sub-layers

Two authentication methods

The role of layering

The role of setting standards

Focus: Data Link Layer

Focus: Network layer

Focus: Transport layer

Review the working principle of routers and switches

Logically uniquely identifies the host

Divide the network

Focus: logos, markers, sheet offsets

Writing format/Computer format

category concept

reserved address

private address

complete process

Capture packets

What to do with two Servers

The port number

Reliability guarantee: serial number/confirmation number

Flow control guarantee: window size

Connection-oriented guarantee: three-way handshake SYN set

Unreliable

Efficient

Why three handshakes are needed

process

Capture packets

serial number

Confirmation Number

The role of window size

Note: No network layer encapsulation

effect

Implementation process

Proxy ARP

Reverse ARP

Gratuitous ARP

two fields

(ping) request package

(ping)reply

Use TTL to control hop count

Use larger UDP port numbers to control peer replies

Use the ICMP type and code fields to determine whether it has arrived.

The relationship between the data link layer and the physical layer

Ethernet2

802.3

The difference between the two

Half duplex principle

Mechanism: listen before transmitting, listen while transmitting, conflict detection, rewind and retransmit

16 discards

The origin of the minimum frame length of 64Byte

top two

OUI

VendorAssigned

Switch Matrix Concept

Cut-through forwarding on switch

Switch store and forward

Fragment-free forwarding on switches

1. User mode

2. Privileged mode

Version details

Interface details

console password

vty password

enable password

Password output encryption

telnet

SSH

Specify the MAC bound to the interface

Verify the status of secure ports

When to use secure ports

effect

source

Format

distance vector routing protocol

link state routing protocol